TWR CTLR TAXIED A CESSNA CITATION ONTO AN ACTIVE RWY IN FRONT OF A PIPER PA30 TAKING OFF CAUSING THE PA30 TO TKOF PREMATURELY DUE TO ITS MAX GROSS WT. THE PLT LOWERED THE ACFT NOSE TO GAIN MORE FLYING SPD AFTER CLRING THE CITATION ACFT.

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PWK GND CLRED MY ACFT; A PA30; TO TAXI TO RWY 12L VIA TXWY A; AND RWY 12R. ACFT WERE OPERATING OFF OF RWY 12L AND RWY 16; INTERSECTING RWYS. PWK HAS FEW TXWYS AND RWYS ARE ROUTINELY USED FOR TAXIING INCLUDING ACTIVE RWYS. AN ACFT WAS ON FINAL FOR RWY 16 WHEN I WAS CLRED FOR POS AND HOLD ON RWY 12L. I TOOK POS; SEEING THE ACFT LAND RWY 16 AND CLR THE RWY. I WAS CLRED FOR TKOF AND BEGAN MY TKOF ROLL. MY ACFT WAS LOADED WITH MYSELF AND 3 PAX; AND NEARLY FULL FUEL; AND WAS AT MAX GROSS WT FOR TKOF; WITH AN OUTSIDE AIR TEMP NEAR 90 DEGS. JUST BEFORE REACHING MY DECISION SPD OF 100 MPH AT ROUGHLY 2200 FT DOWN THE 4400 FT RWY A CESSNA CITATION JET TAXIED ONTO RWY 12L IN FRONT OF ME ON TXWY A; ROUGHLY 3800 FT DOWN THE RWY AND 1600 FT IN FRONT OF ME. I OPTED TO TKOF; RAISED MY GEAR; TRADED AIRSPD FOR ALT (ZOOMING); CLRED THE TAIL OF THE CITATION; AND LOWERED MY NOSE TO ACCELERATE. AFTER ESTABLISHING A NORMAL CLB; I CALLED TO THE TWR AND SAID 'DON'T EVER PUT ANOTHER ACFT ON MY RWY.' MY FLT CONTINUED WITHOUT FURTHER INCIDENT. AFTER RETURNING TO PWK THAT AFTERNOON I CALLED THE TWR. THEY APOLOGIZED FOR THE RWY INCURSION; THE FAULT BEING ATTRIBUTED TO THE GND CTLR. GND OPS AT PWK CAN BE COMPLEX; AND SHOULD BE SIMPLIFIED WITH SPECIFIC RULES ADOPTED TO PREVENT SUCH INCURSIONS. THE PLT OF THE CITATION SHOULD HAVE CHKED TO INSURE HE WAS TAXIING ONTO A RWY THAT DID NOT HAVE AN ACFT WITH 2 LNDG LIGHTS HEADING HIS DIRECTION.